A fractional order PID-based sliding mode controller approach for chemical processes

This paper proposes a novel control strategy for chemical processes by integrating fractional-order PID (FOPID) controllers with sliding mode control (SMC). Through the use of the enhanced flexibility and superior tuning capabilities of FOPID controllers over traditional PID schemes, the method repl...

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Main Authors: Oscar Camacho, Sebastian Vega, Marco Herrera, Antonio Di Teodoro, Juan J. Gude
Format: Article
Language:English
Published: Elsevier 2025-09-01
Series:Results in Control and Optimization
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Online Access:http://www.sciencedirect.com/science/article/pii/S2666720725000785
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author Oscar Camacho
Sebastian Vega
Marco Herrera
Antonio Di Teodoro
Juan J. Gude
author_facet Oscar Camacho
Sebastian Vega
Marco Herrera
Antonio Di Teodoro
Juan J. Gude
author_sort Oscar Camacho
collection DOAJ
description This paper proposes a novel control strategy for chemical processes by integrating fractional-order PID (FOPID) controllers with sliding mode control (SMC). Through the use of the enhanced flexibility and superior tuning capabilities of FOPID controllers over traditional PID schemes, the method replaces the classical discontinuous switching mechanism of SMC with a smooth fractional-order control action. The proposed hybrid approach is evaluated through simulations in two nonlinear systems, a mixing tank with variable time delay and a pH neutralization process, and experimentally validated using the TCLab device. Throughout three case studies, the method demonstrates improvements in performance and response between 40% and 10% compared to the other two SMC alternatives. Furthermore, the approach effectively reduces chattering, improves convergence speed, and improves robustness to measurement noise, contributing to extended actuator lifespan. This makes the proposed methodology particularly attractive for chemical process applications, offering a practical and accessible solution for plant operators by enabling the utilization of robust control techniques without requiring deep expertise in nonlinear control design.
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publishDate 2025-09-01
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spelling doaj-art-0c83ecb543f74473a319fa7732ee64872025-08-20T03:30:30ZengElsevierResults in Control and Optimization2666-72072025-09-012010059210.1016/j.rico.2025.100592A fractional order PID-based sliding mode controller approach for chemical processesOscar Camacho0Sebastian Vega1Marco Herrera2Antonio Di Teodoro3Juan J. Gude4Colegio de Ciencias e Ingenierias, Universidad San Francisco de Quito, Quito, Ecuador; Corresponding author.Colegio de Ciencias e Ingenierias, Universidad San Francisco de Quito, Quito, EcuadorColegio de Ciencias e Ingenierias, Universidad San Francisco de Quito, Quito, EcuadorColegio de Ciencias e Ingenierias, Universidad San Francisco de Quito, Quito, EcuadorDepartment of Computing, Electronics and Communication Technologies, Faculty of Engineering, University of Deusto, 48007, SpainThis paper proposes a novel control strategy for chemical processes by integrating fractional-order PID (FOPID) controllers with sliding mode control (SMC). Through the use of the enhanced flexibility and superior tuning capabilities of FOPID controllers over traditional PID schemes, the method replaces the classical discontinuous switching mechanism of SMC with a smooth fractional-order control action. The proposed hybrid approach is evaluated through simulations in two nonlinear systems, a mixing tank with variable time delay and a pH neutralization process, and experimentally validated using the TCLab device. Throughout three case studies, the method demonstrates improvements in performance and response between 40% and 10% compared to the other two SMC alternatives. Furthermore, the approach effectively reduces chattering, improves convergence speed, and improves robustness to measurement noise, contributing to extended actuator lifespan. This makes the proposed methodology particularly attractive for chemical process applications, offering a practical and accessible solution for plant operators by enabling the utilization of robust control techniques without requiring deep expertise in nonlinear control design.http://www.sciencedirect.com/science/article/pii/S2666720725000785Fractional-order PID controlSliding mode controlHybrid control strategiesNonlinear systemsChemical processes
spellingShingle Oscar Camacho
Sebastian Vega
Marco Herrera
Antonio Di Teodoro
Juan J. Gude
A fractional order PID-based sliding mode controller approach for chemical processes
Results in Control and Optimization
Fractional-order PID control
Sliding mode control
Hybrid control strategies
Nonlinear systems
Chemical processes
title A fractional order PID-based sliding mode controller approach for chemical processes
title_full A fractional order PID-based sliding mode controller approach for chemical processes
title_fullStr A fractional order PID-based sliding mode controller approach for chemical processes
title_full_unstemmed A fractional order PID-based sliding mode controller approach for chemical processes
title_short A fractional order PID-based sliding mode controller approach for chemical processes
title_sort fractional order pid based sliding mode controller approach for chemical processes
topic Fractional-order PID control
Sliding mode control
Hybrid control strategies
Nonlinear systems
Chemical processes
url http://www.sciencedirect.com/science/article/pii/S2666720725000785
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